Washington: Today -- Mostly sunny, high in mid 50s, low near 40. Chance of rain is 10 percent today and 20 percent tonight. Winds will be light and variable. Sunday -- Cloudy -- high in 50s.

Maryland and virginia: Today -- Mostly sunny, high in upper 40s to low 50s, lows from mid 30s to near 40. Sunday -- Cloudy with a chance of rain, high in 50s.

Lower Potomac and Chesapeake Bay: today -- Fair, visibillty more than five miles. Winds will be southerly at 18 knots. Waves in unprotected waters will be one foot or less.

Extended Area Outlook for Monday through Wednesday: There will be a chance of rain at the beginning of the period then partial clearing. High will average from the mid 40s to mid 50s with lows mostly in the 30s. Normal Washington temperatures for the period will be a high of 48 and a low 32.

West Virginia: Today -- Mostly sunny except cloudy in north portions, high in mid 40s to the 50s, lows in upper 20s to mid 30s. Sunday -- Rain likely, highs in upper 40s to the 50s.

The Nation Yesterday: A cold front was spreading snow from the Great Lakes region to the Rockies. Many places were reporting heavy snow. Cold dry air was moving into the northern Plains ending the snowfall in Montana, the Dakotas, and Minnesota. The storm center in Colorado was intensifying and moving eastward. Large amounts of snow have fallen over the north central portion of the nation today. As the storm moves through the middle Mississippi Valley more snow will fall through Saturday. Far away from the storm center, the upper Great Lakes region was feeling the winter weather, 19 inches of snow was on the ground at Houghton, Mich., and more than a foot of snow covered the Chicago, Ill. area. lowa had its share with 11 inches on the ground at Coralvile and Cedar Rapids. The snowfall had not ended over the Rockies.Sheridan, Wyo., had 3 inches of fresh snow for a total of 11 inches on the ground. Leadville, Colo., had 1 more inch which made 11 inches there also. Billings and Helena, Mont., were covered by a foot of snow. The snow had slacked in North Dakota and northern Minnesota but the temperatures were below zero. Readings below freezing dipped into northern Kansas and northern Missouri right behind the cold front. Except for the mountains the southwest was mild and dry. A cold front spread light rain over southern California that was turning to snow in the Sierras.

The National Weather Forecast for today -- Snow will spread over much of the Rockies, the central Plains, through the middle Mississippi Valley, into the Great Lakes region and New England. Cold rain will fall over the southern Plains and coastal Washington. Montana and North Dakota will have sunshine but will only warm into the teens. Even Kansas and Colorado will not warm above freezing. The southern states will have partly sunny skies with mild temperatures, Florida will rise into the 80s. Most of the Atlantic Coast states will be sunny and mild. West Texas through the West Coast will be partly cloudy with cool temperatures.

Almanac Data for today: The sun rises 7:08 a.m., sets 4:47 p.m.; moon rises 9:11 a.m., sets 7:33 p.m. Tides: high 9:10 a.m. and 9:36 p.m. low 3:44 a.m. and 3:51 p.m. High and low tides at the following locations may be obtained by subtracting the hours indicated from the hours above: Annapolis (3 1/4), Bloody Point Lighthouse (4 1/2), Deale, Md. (4 1/2), Colonial Beach (5/), Norfolk (1), Virginia Beach (3/4), Solomons Island (6 1/4), Point Lookout (7).

The Council of Government's Air Quality Index for yesterday showed the high reading in the Washington area during the 3 p.m. period was 14 for the pollutant, particulate matter. Index values between 0 and 24 indicate good air quality. When the index exceeds 100 the air is considered very unhealthy and individuals with lung, heart and eye ailments are urged to restrict their activity. The forecast for today indicates that the air quality will remain good.

The National Weather Service Sorecasts the Potomac River stage at Little Falls should rise to 3.3 feet today.

Washington data for yesterday: Highest temperature since midnight yesterday, 51 degrees at 1:45 p.m. Lowest temperature since midnight, 40 degrees at 6:21 a.m. Excess of temperature since Jan. 1, 230 degrees. Record high temperature for today, 73 degrees in 1970. Record low temperature for today, 15 degrees in 1886. Relative humidity: maximum, 67 percent at 7 a.m.; minimum, 37 percent at 4 p.m. Deficiency of precipitation since Jan. 1,.39 inches. Highest observed wind since 7 a.m., 12 miles per hour from the northwest at 10 a.m. (TABLE) *3*Local Temp., Humidity Time(COLUMN)T.(COLUMN)H. 12 midnight(COLUMN)46(COLUMN)60 1 a.m.(COLUMN)46(COLUMN)60 2 a.m.(COLUMN)45(COLUMN)53 3 a.m.(COLUMN)43(COLUMN)55 4 a.m.(COLUMN)42(COLUMN)57 5 a.m.(COLUMN)41(COLUMN)65 6 a.m.(COLUMN)43(COLUMN)60 7 a.m.(COLUMN)40(COLUMN)67 8 a.m.(COLUMN)40(COLUMN)57 9 a.m.(COLUMN)43(COLUMN)58 10 a.m.(COLUMN)45(COLUMN)51 11 a.m.(COLUMN)47(COLUMN)44 12 noon(COLUMN)48(COLUMN)42 1 p.m.(COLUMN)50(COLUMN)39 2 p.m.(COLUMN)51(COLUMN)38 3 p.m.(COLUMN)50(COLUMN)41 4 p.m.(COLUMN)50(COLUMN)37 5 p.m.(COLUMN)47(COLUMN)44 6 p.m.(COLUMN)45(COLUMN)49 7 p.m.(COLUMN)43(COLUMN)55 8 p.m.(COLUMN)42(COLUMN)60 9 p.m.(COLUMN)41(COLUMN)60 10 p.m.(COLUMN)39(COLUMN)67 11 p.m.(COLUMN)38(COLUMN)70(END TABLE) (TABLE) *3*Temperatures ending 7 p.m. (EST) yesterday: City(COLUMN)L.(COLUMN)H. Albany(COLUMN) 20(COLUMN)42 Albuquerque(COLUMN) 29(COLUMN)63 Amarillo(COLUMN) 29(COLUMN)67 Anchorage(COLUMN) 22(COLUMN)31 Asheville(COLUMN) 33(COLUMN)56 Atlanta(COLUMN) 48(COLUMN)59 Atlantic City(COLUMN) 36(COLUMN)43 Austin(COLUMN) 44(COLUMN)76 Baltimore(COLUMN) 33(COLUMN)48 Billings(COLUMN) 05(COLUMN)17 Birmingham(COLUMN) 32(COLUMN)61 Bismarck(COLUMN)-11(COLUMN)08 Boise(COLUMN) 34(COLUMN)46 Boston(COLUMN) 31(COLUMN)43 Brownsville(COLUMN) 52(COLUMN)82 Buffalo(COLUMN) 25(COLUMN)41 Burlington(COLUMN) 24(COLUMN)33 Casper(COLUMN) 16(COLUMN)30 Charleston, S.C.(COLUMN) 50(COLUMN)54 Char'ton, W. Va.(COLUMN) 27(COLUMN)58 Charlotte(COLUMN) 41(COLUMN)57 Cheyenne(COLUMN) 18(COLUMN)43 Cincinnati(COLUMN) 25(COLUMN)53 Chicago(COLUMN) 26(COLUMN)34 Cleveland(COLUMN) 24(COLUMN)48 Columbia, S.C.(COLUMN) 51(COLUMN)63 Columbus(COLUMN) 21(COLUMN)48 Dal.-Ft. Worth(COLUMN) 37(COLUMN)75 Dayton(COLUMN) 22(COLUMN)51 Denver(COLUMN) 27(COLUMN)57 Des Moines(COLUMN) 25(COLUMN)27 Detroit(COLUMN) 26(COLUMN)41 El Paso(COLUMN) 49(COLUMN)69 Fairbanks(COLUMN) 00(COLUMN)25 Fargo(COLUMN)-16(COLUMN)03 Flagstaff(COLUMN) 29(COLUMN)40 Great Falls(COLUMN) 05(COLUMN)15 Hartford(COLUMN) 23(COLUMN)39 Helena(COLUMN) 13(COLUMN)21 Houston(COLUMN) 58(COLUMN)78 Indianapolis(COLUMN) 27(COLUMN)55 Jackson, Miss.(COLUMN) 47(COLUMN)66 Jacksonville(COLUMN) 55(COLUMN)68 Juneau(COLUMN) 24(COLUMN)35 Kansas City(COLUMN) 40(COLUMN)55 Las Vegas(COLUMN) 40(COLUMN)52 Little Rock(COLUMN) 36(COLUMN)54 Louisville(COLUMN) 28(COLUMN)57 Memphis(COLUMN) 36(COLUMN)60 Miami Beach(COLUMN) 70(COLUMN)83 Midland-Odessa(COLUMN) 37(COLUMN)70 Milwaukee(COLUMN) 20(COLUMN)26 Mpls.-St. Paul(COLUMN) 10(COLUMN)16 Nashville(COLUMN) 28(COLUMN)58 New Orleans(COLUMN) 44(COLUMN)69 New York(COLUMN) 33(COLUMN)45 Norfolk(COLUMN) 46(COLUMN)50 North Platte(COLUMN) 22(COLUMN)29 Oklahoma City(COLUMN) 37(COLUMN)63 Omaha(COLUMN)25(COLUMN)30 Orlando(COLUMN)67(COLUMN)74 Philadelphla(COLUMN)33(COLUMN)46 Phoenix(COLUMN)46(COLUMN)72 Pittsburgh(COLUMN)20(COLUMN)45 Portland, Me.(COLUMN)19(COLUMN)36 Portland, Ore.(COLUMN)43(COLUMN)48 Providence(COLUMN)27(COLUMN)40 Raleigh(COLUMN)40(COLUMN)55 Rapid City(COLUMN)12(COLUMN)20 Reno(COLUMN)35(COLUMN)46 Richmond(COLUMN)35(COLUMN)51 St. Louis(COLUMN)52(COLUMN)59 St. Prbg-Tampa(COLUMN)71(COLUMN)76 Salt Lake City(COLUMN)34(COLUMN)44 San Antonio(COLUMN)43(COLUMN)78 San Diego(COLUMN)54(COLUMN)64 San Francisco(COLUMN)52(COLUMN)60 St. Ste. Marie(COLUMN)04(COLUMN)21 Seattle(COLUMN)42(COLUMN)44 Shreveport(COLUMN)47(COLUMN)67 Sioux Falls(COLUMN)18(COLUMN)22 Spokane(COLUMN)33(COLUMN)37 Syracuse(COLUMN)26(COLUMN)41 Topeka(COLUMN)37(COLUMN)57 Tucson(COLUMN)45(COLUMN)76 Tulsa(COLUMN)40(COLUMN)62 Washington(COLUMN)40(COLUMN)51 Wichita(COLUMN)34(COLUMN)57(END TABLE) (TABLE) *4*Temperatures Abroad Yesterday City(COLUMN)Weather(COLUMN)Time(COLUMN)Temp Aberdeen(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)39 Amsterdam(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)30 Ankara(COLUMN)cloudy(COLUMN) 3 p.m.(COLUMN)41 Athens(COLUMN)clear(COLUMN) 2 p.m.(COLUMN)59 Auckland(COLUMN)clear(COLUMN)12 a.m.(COLUMN)64 Berlin(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)43 Birmingham(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)30 Bonn(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)32 Brussels(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)34 Casablanca(COLUMN)pt. cldy.(COLUMN) noon(COLUMN)70 Copenhagen(COLUMN)cldy(COLUMN) 1 p.m.(COLUMN)36 Dublin(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)45 Geneva(COLUMN)cldy.(COLUMN) 1 p.m.(COLUMN)30 Hong Kong(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)66 Lisbon(COLUMN)cloudy(COLUMN) noon(COLUMN)55 London(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)37 Jerusalem(COLUMN)rain(COLUMN) 2 p.m.(COLUMN)57 Madrid(COLUMN)clear(COLUMN) 1 p.m.(COLUMN)41 Manila(COLUMN)clear(COLUMN) 8 p.m.(COLUMN)73 Moscow(COLUMN)clear(COLUMN) 3 p.m.(COLUMN)21 New Delhi(COLUMN)rain(COLUMN) 5 p.m.(COLUMN)55 Nice(COLUMN)cloudy$ 1 p.m.(COLUMN)50 Oslo(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)23 Peking(COLUMN)clear(COLUMN) 8 p.m.(COLUMN) 3 Rome(COLUMN)rain(COLUMN) 1 p.m.(COLUMN)50 Saigon(COLUMN)rain(COLUMN) 8 p.m.(COLUMN)73 Sofia(COLUMN)pt. cldy(COLUMN) p.m.(COLUMN)37 Stockholm(COLUMN)snow(COLUMN) 1 p.m.(COLUMN)34 Sydney(COLUMN)cloudy(COLUMN)10 p.m.(COLUMN)64 Vienna(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)36 Tunis(COLUMN)pt. cldv(COLUMN) 1 p.m.(COLUMN)59 Tokyo(COLUMN)clear(COLUMN) 9 p.m.(COLUMN)54 Warsaw(COLUMN)cloudy(COLUMN) 1 p.m.(COLUMN)37(END TABLE) (TABLE) *4*Temperatures (Western Hemisphere) City(COLUMN)Weather(COLUMN)High(COLUMN)Low Acapulco(COLUMN)clear(COLUMN)88(COLUMN) 75 Barbados(COLUMN)rain(COLUMN)81(COLUMN) 77 Bermuda(COLUMN)pt. cldy.(COLUMN)79(COLUMN) 75 Calgary(COLUMN)snow(COLUMN)25(COLUMN) 05 Culiacan(COLUMN)pt. cldy.(COLUMN)88(COLUMN) 61 Edmonton(COLUMN)clear(COLUMN)12(COLUMN)-22 Havana(COLUMN)clear(COLUMN)90(COLUMN) 70 Kingston(COLUMN)clear(COLUMN)90(COLUMN) 75 Montego Bay(COLUMN)clear(COLUMN)88(COLUMN) 75 Mexico City(COLUMN)pt. cldy.(COLUMN)75(COLUMN) 50 Monterrey(COLUMN)clear(COLUMN) 77(COLUMN) 52 Montreal(COLUMN)cloudy(COLUMN) 39(COLUMN) 12 Ottawa(COLUMN)cloudy(COLUMN) 39(COLUMN) 16 Regina(COLUMN)clear(COLUMN)-04(COLUMN)-22 St. Kitts(COLUMN)pt. cldy.(COLUMN) 86(COLUMN) 74 Toronto(COLUMN)cloudy(COLUMN) 37(COLUMN) 21 Vancouver(COLUMN)cloudy(COLUMN) 46(COLUMN) 39 Vera Cruz(COLUMN)cloudy(COLUMN) 86(COLUMN) 73 Winnipeg(COLUMN)clear(COLUMN) 06(COLUMN)-18(END TABLE)